#include<stdio.h> 

long  f(int  g)
{
	switch (g)
	{
	case 0:return  0;
	case 1:
	case 2: return  1;
	}
	return  (f(g - 1) + f(g - 2));
}

int main()
{
	long
		k;
	k = f(7);
	printf("k= %d\n", k);
	return 0;
}